Pest symptoms: the disease is a common and serious disease in the north and south, which mainly damages the roots. When the nematode invades the lateral root or fibrous root, it forms many galls of different sizes, which are yellow white at first and brown later. The pear shaped small nematode, i.e. female, is born inside the gall. The damaged plants grew slowly, the stem was thin and short, the leaves gradually turned pale from top to bottom and lost green, the leaf margin rolled back, shrunk and withered, and the flower bracts were yellow and withered or not open.
Prevention and treatment method: Disinfect basin soil with medicine. Dig a hole or ring ditch in the basin soil, apply 5-10ml of the original solution of each basin, immediately cover the soil and flatten, fumigate for half a month, and then plant flowers. It can also use 1000 fold solution of 80% Dichloroisopropyl ether emulsion, 10-15ml for each basin, or 200-300 fold solution of 80% Dibromopropane, 400ml for each basin, the method is the same as above.
Insect damage performance: mainly the larva nibbles on the leaves, resulting in incomplete leaves. When serious, it also damages the flowers.
Moth morphology: adult brown green, 40 mm long. There were gray marginal hairs on both sides of the head and chest; there were two silver longitudinal lines on the back of the abdomen, and the abdomen was yellowish. The front wing is grayish brown green, and there is a wide yellowish brown diagonal band from the top corner to the base of the rear edge, with several black and white stripes inside and outside the diagonal band; the rear wing is blackish brown, with a grayish yellow horizontal band, and the edge hair is white.
Control method: in the period of larva damage, 2000 times of 20% pyrethroid emulsifiable concentrate or 1000-1500 times of 90% trichlorfon or 50% fenitrothion emulsifiable concentrate can be used for control.
The adults were lured and killed by black light.
